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What do
...rther constrain one of its type parameters. Here's an example:
case class Foo[A](a:A) { // 'A' can be substituted with any type
// getStringLength can only be used if this is a Foo[String]
def getStringLength(implicit evidence: A =:= String) = a.length
}
The implicit argument evidence is ...
What's the use of do while(0) when we define a macro? [duplicate]
...up several statements into one macro.
Assume you did something like:
if (foo)
INIT_LIST_HEAD(bar);
If the macro was defined without the encapsulating do { ... } while (0);, the above code would expand to
if (foo)
(bar)->next = (bar);
(bar)->prev = (bar);
This is clearly not...
How to split (chunk) a Ruby array into parts of X elements? [duplicate]
...
Take a look at Enumerable#each_slice:
foo.each_slice(3).to_a
#=> [["1", "2", "3"], ["4", "5", "6"], ["7", "8", "9"], ["10"]]
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Difference between parameter and argument [duplicate]
...d actual parameter etc.
So here, x and y would be formal parameters:
int foo(int x, int y) {
...
}
Whereas here, in the function call, 5 and z are the actual arguments:
foo(5, z);
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How to clear ostringstream [duplicate]
...his method? For example, for (int i=0; i<100; ++i) { std::ostringstream foo; foo << "bar"; std::cout << foo.str() << " ";}. Will this print: bar bar bar [...] or bar barbar barbarbar [...]?
– Thanasis Papoutsidakis
Nov 2 '13 at 15:42
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jQuery dot in ID selector? [duplicate]
... escaped with with two backslashes: \\. For example, an element with
id="foo.bar", can use the selector $("#foo\\.bar").
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Using a string variable as a variable name [duplicate]
...
You can use exec for that:
>>> foo = "bar"
>>> exec(foo + " = 'something else'")
>>> print bar
something else
>>>
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Swift equivalent of [NSBundle bundleForClass:[self class]]
... class inside your value type. Example of the latter solution: Bundle(for: Foo.Bar.self) where Foo - your struct, Bar - some inner class.
– Vadim Bulavin
Apr 24 '17 at 13:37
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关于jQuery的AJAX不兼容IE的解决办法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...查看手册后发现请求的数据格式还是有一种JSON格式，如{foo:["bar1", "bar2"]} ，然后就按照这种格式书写，还真的返回了正确的查询结果。真不知道IE还有这点要求。（完）
先前的格式：
type: "get",
data: "bid="+my_bid+"&name_cn="+...
sqlite 命令行创建一个空库 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...的SQLite数据库的优势，比touch创建一个空文件好。$sqlite3 foo db "create table t(f int); drop table t;"可以通过以下方 SQLite创建一个空白的数据库，具有被识别为有效的SQLite数据库的优势，比touch创建一个空文件好。
$sqlite3 foo.db "create t...